a) 53.33
b) 54.68
c) 55
d) None of these
Answer: b
Explanation:
$$\eqalign{
& {\text{Required}}\,{\text{average}} \cr
& = {\frac{{55 \times 50 + 60 \times 55 + 45 \times 60}}{{55 + 60 + 45}}} \cr
& = {\frac{{2750 + 3300 + 2700}}{{160}}} \cr
& = \frac{{8750}}{{160}} \cr
& = 54.68 \cr} $$
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